/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.execution.operator.process.last;

import org.apache.iotdb.commons.path.AlignedPath;
import org.apache.iotdb.commons.path.MeasurementPath;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.db.metadata.cache.DataNodeSchemaCache;
import org.apache.iotdb.db.mpp.execution.operator.Operator;
import org.apache.iotdb.db.mpp.execution.operator.OperatorContext;
import org.apache.iotdb.tsfile.read.TimeValuePair;
import org.apache.iotdb.tsfile.read.common.block.TsBlock;
import org.apache.iotdb.tsfile.utils.TsPrimitiveType;

import static org.weakref.jmx.internal.guava.base.Preconditions.checkArgument;

/**
 * update last cache for aligned series
 */
public class AlignedUpdateLastCacheOperator extends AbstractUpdateLastCacheOperator {

    private final AlignedPath seriesPath;

    private final PartialPath devicePath;

    public AlignedUpdateLastCacheOperator(
            OperatorContext operatorContext,
            Operator child,
            AlignedPath seriesPath,
            DataNodeSchemaCache dataNodeSchemaCache,
            boolean needUpdateCache) {
        super(operatorContext, child, dataNodeSchemaCache, needUpdateCache);
        this.seriesPath = seriesPath;
        this.devicePath = seriesPath.getDevicePath();
    }

    @Override
    public TsBlock next() {
        TsBlock res = child.nextWithTimer();
        if (res == null) {
            return null;
        }
        if (res.isEmpty()) {
            return LAST_QUERY_EMPTY_TSBLOCK;
        }

        checkArgument(res.getPositionCount() == 1, "last query result should only have one record");

        tsBlockBuilder.reset();
        for (int i = 0; i + 1 < res.getValueColumnCount(); i += 2) {
            if (!res.getColumn(i).isNull(0)) {
                long lastTime = res.getColumn(i).getLong(0);
                TsPrimitiveType lastValue = res.getColumn(i + 1).getTsPrimitiveType(0);
                MeasurementPath measurementPath =
                        new MeasurementPath(
                                devicePath.concatNode(seriesPath.getMeasurementList().get(i / 2)),
                                seriesPath.getSchemaList().get(i / 2),
                                true);
                if (needUpdateCache) {
                    TimeValuePair timeValuePair = new TimeValuePair(lastTime, lastValue);
                    lastCache.updateLastCache(
                            getDatabaseName(), measurementPath, timeValuePair, false, Long.MIN_VALUE);
                }
                LastQueryUtil.appendLastValue(
                        tsBlockBuilder,
                        lastTime,
                        measurementPath.getFullPath(),
                        lastValue.getStringValue(),
                        seriesPath.getSchemaList().get(i / 2).getType().name());
            }
        }
        return !tsBlockBuilder.isEmpty() ? tsBlockBuilder.build() : LAST_QUERY_EMPTY_TSBLOCK;
    }
}
